As an admin, you can turn off multi-factor authentication. I've put this together specifically for people who might have signed up for a Microsoft 365 trial, or perhaps you've set up a tenant to run training with a group. With MFA off, users wont be prompted to provide a phone number or another authentication method when trying to sign in to their Microsoft Tools.
With a free trial of Microsoft 365 you can use the Power Platform and Microsoft 365 tools without interfering with your normal work account. Useful for creating demos or for training.
Check out these PowerPoint and Word templates ready to use for your Halloween party